Katherine Sonnichsen
Firefighter at City Of Markham. On Ontario’s disclosure list 9 years between 2017 and 2025.
- Salary paid
- $133,030.69
- Taxable benefits
- $414.45
- Total disclosed
- $133,445.14
Change from 2024: +$17,032 (+14.7%)9years on
the list
Among 2,945 people with the title “Firefighter” in 2025
Paid more than 56% of them. Their median: $131,274.
Among 696 people at City Of Markham in 2025
329th highest paid. Their median: $131,919.
Paid more than 67% of everyone on the 2025 disclosure list, which only lists people paid $100,000 or more.
Salary by year
Show as a table
| Year | Salary | Median for the job |
|---|---|---|
| 2017 | $120,406 | $107,942 |
| 2018 | $105,290 | $116,000 |
| 2019 | $111,617 | $112,906 |
| 2020 | $120,210 | $116,604 |
| 2021 | $125,256 | $139,996 |
| 2022 | $131,113 | $145,766 |
| 2023 | $129,552 | $120,313 |
| 2024 | $115,999 | $122,963 |
| 2025 | $133,031 | $131,274 |
History
| Year | Employer and job | Salary | Benefits | Change |
|---|---|---|---|---|
| 2025 | City Of MarkhamFirefighter | $133,031 | $414 | +$17,032 (+14.7%) |
| 2024 | City Of MarkhamFirefighter | $115,999 | $394 | −$13,553 (−10.5%) |
| 2023 | City Of MarkhamFirefighter | $129,552 | $438 | −$1,561 (−1.2%) |
| 2022 | City Of MarkhamCaptain | $131,113 | $557 | +$5,857 (+4.7%) |
| 2021 | City Of MarkhamCaptain | $125,256 | $509 | +$5,046 (+4.2%) |
| 2020 | City Of MarkhamFirefighter | $120,210 | $443 | +$8,594 (+7.7%) |
| 2019 | City Of MarkhamFirefighter | $111,617 | $427 | +$6,327 (+6.0%) |
| 2018 | City Of MarkhamFirefighter | $105,290 | $449 | −$15,116 (−12.6%) |
| 2017 | City Of MarkhamFirefighter | $120,406 | $408 |
Compare
Questions and answers
Why is Katherine Sonnichsen on the disclosure list?
City Of Markham paid Katherine Sonnichsen $133,031 in 2025. Ontario’s public employers must disclose everyone they paid $100,000 or more in a calendar year, under the Public Sector Salary Disclosure Act, 1996.
What does “salary paid” include?
What the employer paid in the calendar year, so it can include overtime, retroactive pay, vacation payouts, severance or a partial year. Taxable benefits are listed separately. How the lists work
What do the comparisons mean?
Ranks and shares are among people on the same year’s list only: those with the same title, those at the same employer, or everyone listed. People paid under $100,000 are not on the list, so they are not counted.
How do I report a mistake or ask for a record to be removed?
Privacy and corrections explains both. Figures are shown exactly as Ontario published them; we fix matching mistakes and handle removal requests there.
Years are matched by name and employer. Salary paid can include overtime, retroactive pay and one-time payments. Figures are exactly as Ontario published them. How we match years · Report a mistake or ask for removal